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How does the urodele ear develop?

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Figure

Fig. 1. A salamanderright ear are shown
Fig. 2. This drawingshowsthebetweenthepresumedinductiveinteractionsthe neuroectodermIn) and the mesoderm(representedbynotochord,not)whichinducean oticplacode(pi whichwillinvaginateinto an otic pit top) thatwill separatefrom the ectoderm(light grey) to becomethe otocyst.Experimental evidence indicates thatthere is variation in the relative importance of the neuroectodermal andmesodermalrnductive actions (arrows) probably over time (asshown here)and also between species.
Fig. 3. At the level of oticpitformationthepolarityof theearbecomesfixedandleadstothenormaldifferentiationof anasymmetricear.Rotationof the otic placodewith a reversalof theanterior-posterioraxis(A,P) leadsto theformationof an enantiomorphicear which consi
Fig. 4. Thesegregationposteriorsegregationof sensoryepitheliain Ambystomais shown.Note that the commonmacularCM:A) first givesrise to the anteriorandcanaf cristae (AG
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